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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c5eb80be20eb1a31d574815295b78a051069ac2e7e6da2a8c153a94868676b' 
  AND token = 'HtPZ0t5CvUnGUmG8+YVqYlt7732aBvtHBcWBaRi+DjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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