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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e27d990cfbd74938170be44daba76b3671691ff6c5b456b5c221614bab6f8329' 
  AND token = 'fkKqyuUS0h0A9ZPB4e5DChy6QRXKAJu+HoQx4zrKxa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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