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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e2ff494a844a4adc721a274ee77c5bada71863a4a43284b81f7bad576cf1f5f' 
  AND token = '36weVpHgYBO2XyAQs8XH/AUn0A+lWOuFVLcT/fXslmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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