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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '210ae516c55c78fa26adb84f26bbbb283522d7a4f0e50183210f0529e572f0c6' 
  AND token = '2yYzIifsBrIp4kmnureCEcIoJwMqAZgQFn7fMjRjXt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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