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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ded6877687fe4734d79613ba50b141fbbeae3143c16d3954e3fece17ffdbf30b' 
  AND token = 'IkyaVbno200COixrDcWDWlPP9jjM+9Zxa63tMgMndb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}