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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df70c9264fd0ec6ac096a525fb9b8233084f997df18efe06e4f1816d2614079c' 
  AND token = 'fknaHCORYdUJrLrvpNi5uel2ZzFOFOVooY/Bv5liVYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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