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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830984b5803e1d6bd87508ab8aed9d53b87ad804b4f473bdcbf67c118894f1af' 
  AND token = '8HuGWQ5rCCZGOZ8hIvIYrNsJK+KwxwsH3ZV9kwo2dSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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