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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09122a21be086231419b947d1c1fdb7e3fab73b5d95440100401b8c57067aace' 
  AND token = 'yt+xr9NDV09A+1tduBsiM+jy0hWrILye9Y1FhSCQptA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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