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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0765b98bedc603e5e8dd11af3cd4d3720fd244c6e738be18a2f3d7047ffa12b' 
  AND token = 'zX+mzD8HnITzuMNut4ubsIL7fetyIAAF0WnZbicwY2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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