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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee14f35abbbfb26db240c4045664cc6eeb146dce7932578696e0f0e9896672e' 
  AND token = 'vqspTebKM59gUNHrW2Py1uKE3yQ5oIyF53LyntGeWFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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