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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07dbfae453f43cd56d5b741009cb360e8f95a0cc724e078905d715e8190573f3' 
  AND token = '1tEm1C4f2jvkHhEgDjwEN2cxgvc3Bqs/E8bk8UBCYgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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