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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82868b1f14dbcf0355a18819317c817c1545d29ff78cb1309a3ddd935bd2a5db' 
  AND token = 'l60Mf51z4OlgneRnczfbuwm3w6izdRGUahnquSkRsAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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