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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5021be69b5d9736d156cbaf602a43b9750fa19ec1502decce95392e597048cc8' 
  AND token = 'VBy8yC5SDnGYQnJ2eSWRF/DyseYdRJMam4Ku5fxIRbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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