SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3322c80374c2f3b706b9b83df65af44193646a0536f03a656c17b194ca00285' 
  AND token = '8YpQjQEyF+XaG7UOfIA/vUg9dQPPOqFjt5ckpq+vesw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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