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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a255097e51f96ed9407048a13c4d1b2425e7891cd1906ea5d80c65782328a2e8' 
  AND token = 'ZT04NpP7Jzmp6PgbJEN06I7fD68QwBp6Sp0+7hS1LWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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