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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88642e4e7f109e08d6fa155ebc0960d6c8529c2f5ab6b7e0049efd4daded2ebe' 
  AND token = 'ZLfoTxoNxicT7H047LyC/FkQrCrZ0kvO3g1xgENB+oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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