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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1bb740e1d4ceafe70c40074d08b6a310ffede782235b50db9f3b43da3a6815' 
  AND token = 'F3NrAlk20lN+EDbArl8L7Qpr0RzIUmXMHpDNu65ktLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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