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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47c6a61932d04060b66d8271d0a7a284d782b77b65ba42e9cea712559cae60f9' 
  AND token = 'q6O8I6OjZopGEzz+10Hmg5PvU/zNzCs4MJjWkTPK6eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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