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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a009b84e3c830484caa58463e1d39c3b81fd89b1fac5b02f12c240190dcd4483' 
  AND token = 'Sgg+UYEuB8HCwJHqKv1lWQYLZpHFFuTuKFNaCsDVEM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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