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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a65ba591030ea8f02ccb9d61f9a32c272ce018aa622a0f5dc58f3363a68d77f' 
  AND token = 'pKvfTPqcyf55uGoIaoTpcId/MzYIBWZ5k8cGdgK1CdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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