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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f86feac85d83c197ac015924e6a3c1c8cbb96f4875d64b949245f1bcca8e552' 
  AND token = 'x0xKZLt09p/9/YBvo4xHQD0iqH0BUOY69Szg/7jM6W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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