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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd163ae863104777f75dc15fdeee60b5b5c8bfa35871145161b0022c925160e1' 
  AND token = 'kNeN3kVX4FJSsucH4GBUGNqql4rYtdwwHXv5T7OPujo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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