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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d95229953837555472b97c129de1883570edf1b391b7bb545e737fe80e2743' 
  AND token = 'yA4GHqMBk8Ydr1CaZ3BdTG0oQKKKifFIGheS9eKDjGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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