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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b93f04b3496418f0c31f66317c36271641d7efec6ead2c9fdc3ac8b8a48a6d8' 
  AND token = 'CaqlHaBNVJIeF7dQWuwu+gySB8G3f+3A/aGd8Qbjwtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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