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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd518fd859e6ed7e78d3ceff350c2144e6827b94b8847f1799f641f33aef71d28' 
  AND token = 'NpELIXiEMKLhKw+aV7o9pNjWhKSJojVi+na2Wahcsqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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