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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc70a6cbba508a36fd4a42e04f9f83205d9817caefdf23e9f97ed8d8b9d007ce' 
  AND token = 'jW24MYfGT1TxMwE/oGptNgM8CDamfKtTEbxJgDAMhTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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