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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4836b6e84c27b16e71c0373c02785e5d0648c12f2b755eeda912859b786b5121' 
  AND token = 'lu3K7xU1sYqyKJEQax2pwLid8QE6q8dj16OeDf/wOb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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