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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5c614cd4fde1430b26016c707a27c030be46f764f0cdf99c8d397550026a2db' 
  AND token = 'fhbAwuFJOCP0ZCks4nRfU5asWLdGdvO1WXtQXHdZvvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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