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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9809eda77890a543005a37fc050abf39d4d57b274e5bd213525af041647603fa' 
  AND token = 'qbZmVdMHUG8wEijxtAjcz3MAO792b5uUGWBpE/v5o4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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