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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13b31efd1dcdb5a569009b2535380d60ccb0bacb1a6c6d987edb2e82adcafa1c' 
  AND token = '3de644IzKI2sA+q8ky8A7Y//FLrIHuhTF3rtRi7AmJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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