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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77579fd9aa6545205288b072ed0f396d66ef67d7ed453a8910df98b8082adfbe' 
  AND token = 'M7KpDixh/ppIOaaRmm9RIAeVPLdBKGGE5k08y3YAq4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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