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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecc616c35fe872f85bb2dceb66e4bc57b371e8c4db0d2b55c0efc2b7b1127062' 
  AND token = 'YocbHpjdHUToh0ehlxCVR13KAhz0S6tbroc6+3GdtyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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