SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23a2c6771737994c66c82303f8239a4deac6233687521df5061e40aec8d2506' 
  AND token = 'HxxyDGD+p2RPVk+q4+Jw2phLwpAzUMgp2HDZJ7D3fSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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