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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab47870208d1ae708a88cb0e952aa15cea85455db4a89843be2c405fac9de487' 
  AND token = 'EhuJe91f/qKfAMaYrdlHdn+6PDxXZXx7A9oea5UN/R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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