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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd2ef5992674cca56c9a8d8ddde01cd86064decdb59dfc67fa9a45ed3b478dd' 
  AND token = '9Tx5vyiNoOerpaesJ1XISoY4nS5h1irNx6UEbzcIYZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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