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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb244f6b6ed4bc71cc452360635db3e95546f1bd794f546ffd5d2985ddc1f84' 
  AND token = 'qanjTyFyquflsh0OdZegmtv0UMjEP/knomzpD4O/59s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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