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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84518eef1c18cad85499085e009fe00c4874111b61be6051407e2a8981fdd08a' 
  AND token = 'JGAfgjYtjY0L9MyyVJ5pcd/x6DykNpvBE0Gw5bE8BdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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