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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2588e8e3fffc5fb21ed33ffd12f65bddfb3ec8ff10798443ba6dd18591d52e67' 
  AND token = 'd3c1iR5yJyU0r71rlxI9SGtgwN9v7NQg4XjxJv7XxP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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