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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e551c5a0b90c88f9651db0cf985ee8245ca520e3de7a13b6d6c68e9db1ed3c13' 
  AND token = 'z/sncuOJTKcizRpIJWlBQZJ058J7u6KkjzpnsXVwtmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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