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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7749a1b6b8819a8cba70754bbc08e0c6f144e78e27aec667c77ec14cc778108' 
  AND token = 'KDEXCsDQZUhfz1Wp7f0Ckeo5jneSDL6MIQPecfW8CIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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