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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fdbccb63283ce6c349ebf533d986a8e1f554e1b59d9cb8b9fa6506932591b9' 
  AND token = '4dboEM7vUspaE6g3jj/LJDePKJ6ZS+cQAzK6TdUaX74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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