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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb13fd5258c4cae30773c99fee3e28d32307d754a14254755c9addfb0c7d41f9' 
  AND token = 'bHTiqyM5EaHLHW0a0YRcEgDlP2dEBTlcRrsZHWgP8XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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