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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36dd149e00a3e72308fb5fad09563865b1cefa12200fd4eeb3f8efb8be81b75' 
  AND token = '3lMQEk+1ZxjN+tm6Ztlc/kihjwg2HAf0RfcrtjABJOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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