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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c19e97eadfb50031db5019b1577856544d1c557af02d62af23f3fae4bddbfe' 
  AND token = 'Qor0rdHaUxqFvA0ngL4FmYb2pHEZNTPAwV55NzsXzfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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