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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4052a2f644bf5a4ce2f5f4f4489311a82ab9d3ffdc4ff908a1ce80b5b2400f' 
  AND token = 'KZ46eXoQnu1R1yn0PDQtucn5qsnumAnDnCNw0Ng6qR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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