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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '813cf1b4370b3b86e908202013b2db36d525acfeedded9649012a983451fb57f' 
  AND token = 'VvYQfAkTERw61zTE/U6Q9bE8hq235drw2jV6MV/P9JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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