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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5558ffef70045395d2256fca7d46f44518c921f1ad18e62355c15a727751b320' 
  AND token = 'S0wwD3T7aTjlXeLDapPxMj6BcqiIZxdRV03S8x9sPbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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