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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058936e92dceac6a27575a8f30b22f7ce82cb4466ca1eec3519a0c18c79b8965' 
  AND token = 'NO1HIBQ6Qu5ypt45G+EiK47MhWZ8nNb3PiHJtWIz7Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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