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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad708dfb75fcbcd285ba71cb428468de44c31d6f104005fe55600cc0e60e0afd' 
  AND token = 'sQaNUxXJkbBwPD90u90dhtqkIOLnu3KGn+Tuzr7H64E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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