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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8b75f73de44d8ab1f9c901df08e0458a85d351d8ce18304d6d13bf6e5ba9db7' 
  AND token = 'InsK2TX25Y91J2ZA8xboqfN29TB/P7x016KTJm5SEjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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