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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96c6cc1001792dfc77d225440f54c3e2fc1edeebf02406af08411f46c589dca' 
  AND token = 'DcRwFaQkwh37ndVFFdGBZMT8f1LAGt7MzvpaP8PIifQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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