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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853d7527b1ef98105cfb63e071ac78f66904249a989fe0a607c75da662d441f8' 
  AND token = 'geqPgbyJhFE1MkKWWToM80d/dxLBuYAjBtyTh4p+ku8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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