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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e03111ffa1c4c9b858b12a3bace1299777831686239b9d1f5be5c0a26363781' 
  AND token = 'YVgoUQ0s6Hs8I43TQZcxjIzSwFHGWkea6qgFSyeQN+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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